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-rwxr-xr-xgit-difftool--helper.sh59
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+#!/bin/sh
+# git-difftool--helper is a GIT_EXTERNAL_DIFF-compatible diff tool launcher.
+# This script is typically launched by using the 'git difftool'
+# convenience command.
+#
+# Copyright (c) 2009 David Aguilar
+
+# Load common functions from git-mergetool--lib
+TOOL_MODE=diff
+. git-mergetool--lib
+
+# difftool.prompt controls the default prompt/no-prompt behavior
+# and is overridden with $GIT_DIFFTOOL*_PROMPT.
+should_prompt () {
+ prompt=$(git config --bool difftool.prompt || echo true)
+ if test "$prompt" = true; then
+ test -z "$GIT_DIFFTOOL_NO_PROMPT"
+ else
+ test -n "$GIT_DIFFTOOL_PROMPT"
+ fi
+}
+
+# Sets up shell variables and runs a merge tool
+launch_merge_tool () {
+ # Merged is the filename as it appears in the work tree
+ # Local is the contents of a/filename
+ # Remote is the contents of b/filename
+ # Custom merge tool commands might use $BASE so we provide it
+ MERGED="$1"
+ LOCAL="$2"
+ REMOTE="$3"
+ BASE="$1"
+
+ # $LOCAL and $REMOTE are temporary files so prompt
+ # the user with the real $MERGED name before launching $merge_tool.
+ if should_prompt; then
+ printf "\nViewing: '$MERGED'\n"
+ printf "Hit return to launch '%s': " "$merge_tool"
+ read ans
+ fi
+
+ # Run the appropriate merge tool command
+ run_merge_tool "$merge_tool"
+}
+
+# Allow GIT_DIFF_TOOL and GIT_MERGE_TOOL to provide default values
+test -n "$GIT_MERGE_TOOL" && merge_tool="$GIT_MERGE_TOOL"
+test -n "$GIT_DIFF_TOOL" && merge_tool="$GIT_DIFF_TOOL"
+
+if test -z "$merge_tool"; then
+ merge_tool="$(get_merge_tool)" || exit
+fi
+
+# Launch the merge tool on each path provided by 'git diff'
+while test $# -gt 6
+do
+ launch_merge_tool "$1" "$2" "$5"
+ shift 7
+done